sympy/sympy — pull request #8431 by wanglongqi (2014-11-12 07:38:12+00:00)
Title: Code quality: don't assign to self #8362

Most fixes are direct, some doubts in patch are

pretty.py the code always has `e=self` then `self=e`, unknown reason
tensor.py changing self to tensor is a little strange for codes between line 3058-3060
interval_arithmetic.py the change may influence the readbility

All the rest cases are not suitable to fix in this issue. As they are used intentionally.

sympy/galgebra/ga.py: self = MV.characterize_expression(self, base)
sympy/galgebra/ga.py: self = MVtypes[mvtype](self, base)
sympy/matrices/dense.py: self = object.__new__(cls)
sympy/polys/rings.py: self = self.square()